CRUDE OIL RECOVERY METHOD

Abstract: this method for recovering crude oil has a reservoir modification fluid injection step of pressing and injecting, through an injection well into a crude oil-containing reservoir between the injection well and a production well, a reservoir modification fluid that reforms the wettability of the reservoir, a primary crude oil recovery step of pressing and injecting an overflush fluid through the injection well into the reservoir, thereby moving the crude oil contained in the reservoir from a side of the injection well toward a side of the production well, and enabling recovery of the crude oil from the reservoir via the production well, and a secondary crude oil recovery step of pressing and injecting a foam-stabilizing fluid and a foam-forming fluid through the injection well into the reservoir, thereby moving the crude oil contained in the reservoir from the side of the injection well toward the side of the production well, and enabling recovery of the crude oil from the reservoir via the production well.

Inventor(s): Ayae ITO, Daisuke ITO, Yutaro KAITO

CPC Classification: E21B43/16 (Enhanced recovery methods for obtaining hydrocarbons)

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